1 files changed, 30 insertions, 0 deletions
diff --git a/libcxx/test/std/depr/depr.c.headers/math_h_isnan.pass.cpp b/libcxx/test/std/depr/depr.c.headers/math_h_isnan.pass.cpp
new file mode 100644
index 00000000000..118f96bdd43
--- /dev/null
+++ b/libcxx/test/std/depr/depr.c.headers/math_h_isnan.pass.cpp
@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <math.h>
+
+// isnan
+
+// XFAIL: linux
+
+#include <math.h>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#ifdef isnan
+#error isnan defined
+#endif
+    static_assert((std::is_same<decltype(isnan((float)0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isnan((double)0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isnan(0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isnan((long double)0)), bool>::value), "");
+    assert(isnan(-1.0) == false);
+}